Question about 1996 Cadillac DeVille

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Do you have to put some type of pellets in your radiator after you instale it ??

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No, this is no longer deemed necessary.
The pellets or tablets were originally used because of the porosity in the aluminium alloy,which was prone to "nuisance leeks".
The tablets were installed at the factory.
A recent GM bulletin states that it is no longer necessary to replenish the cooling system with coolant supplement tablets.

Posted on May 16, 2010


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How to replace a thermostat on a 1997 ford ranger 2.3

Basically, remove and replace, drain coolant from radiator, locate t-stat housing, remove bolts, remove t-stat and replace with new,make sure the pellet end of t-stat goes in first, re install housing and new gasket or o ring, refill, burp air, and top off, put on the cap, That's about it.

Jan 10, 2015 | 1997 Ford Ranger SuperCab

1 Answer

What are radiator pellets and where do you get them?

I don't recommend pellets they will clog the radiator and heater core..if you have a radiator leak replace it....trying to do a cheap fix will only come back to bite you.if you put stop leak it will reduce you cooling,and cause it to blow a head gasket.that cost 10 times more than a 100.00radiator

Oct 31, 2013 | 2001 Cadillac DeVille

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Losing coolant but can not see a leak


Dec 08, 2010 | 2000 GMC Sierra

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Upsit2mitch@How do I change the thermostat?

two bolts on the thermostatic housing connected to a thick hose.


2.7L Engine

  1. Disconnect negative cable.
    CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
  2. Drain cooling system.
  3. Remove radiator lower hose from thermostat housing.
  4. Remove nuts from heater tube flange studs.
  5. Loosen starter bolt at heater tube bracket.
  6. Pull heater tube out of thermostat housing and position out of the way.
  7. Remove bolt and two studs.
  8. Remove thermostat housing, O-ring and thermostat.
  9. Remove thermostat housing bolts.

To install:
  1. Clean gasket sealing surfaces.
    NOTE Install thermostat with the bleed valve located at the 12 o'clock position, between tabs on seal.
  2. Install thermostat and seal into thermostat housing .
  3. If removed, install two studs.
  4. Install thermostat, thermostat housing and O-ring and bolt. Tighten attaching bolts to 105 inch lbs.(12 Nm).
  5. Lubricate new heater return tube O-ring with coolant.
  6. Position heater return tube flange over two studs. Install nuts.
  7. Tighten retaining nuts to 53 inch lbs.(6 Nm).
  8. Tighten starter bolt to 40 ft. lbs. (54.3 Nm).
  9. Connect the lower radiator hose to the thermostat housing. Install hose clamps.
  10. Refill cooling system.
  11. Inspect for leaks.
  12. Connect negative cable.

3.2L & 3.5L Engines

  1. Disconnect negative cable.
    CAUTION Do not remove pressure cap with the system hot and under pressure because serious burns from coolant can occur.
  2. Drain cooling system.
  3. Raise vehicle on hoist.
  4. Disconnect electrical connectors from engine oil and power steering pressure switches.
  5. Disconnect radiator and heater hoses from thermostat housing.
  6. Remove thermostat housing bolts.
  7. Remove housing, thermostat, and gasket.
    NOTE The OEM thermostat is staked in place at the factory. To ensure proper seating of replacement thermostat, carefully remove the bulged metal from the thermostat housing using a suitable hand held grinder. It is not necessary to restake the replacement thermostat into the thermostat housing.

To install:
  1. Position gasket on thermostat and housing.
  2. Install thermostat housing, gasket and mounting bolts onto block. Tighten attaching bolts to 105 inch lbs. (12 Nm).
  3. Install radiator hose.
  4. Install bypass hose.
  5. Connect electrical connectors from engine oil and power steering pressure switches.
  6. Connect negative cable.
  7. Fill cooling system.
  8. Inspect for leaks.
  9. Lower vehicle on hoist.

The thermostat is operated by a wax filled chamber (pellet) which is sealed. When heated coolant reaches a predetermined temperature the wax pellet expands enough to overcome the closing spring and water pump pressure, which forces the valve to open. Coolant leakage into the pellet will cause a thermostat to fail open. Do not attempt to free up a thermostat with a screwdriver. Thermostat diagnostics is included in power train control module's (PCM) programming for on-board diagnosis. The malfunction indicator light (MIL) will illuminate and a diagnostic trouble code (DTC) will be set when an -open too soon- condition occurs. Do not change a thermostat for lack of heater performance or temperature gauge position, unless a DTC is present. For other probable causes,. Thermostat failing shut is the normal long term mode of failure, and normally, only on high mileage vehicles. The temperature gauge will indicate this.
The engine cooling thermostats are a wax pellet driven, reverse poppet choke type. The thermostats have an air bleed located in the thermostat flange. The air bleed allows internal trapped air during cooling system filling to be released. The thermostat on the 2.7L and 3.5L engines are located on the lower left side of engine, near the front. The thermostat on both engines are on the inlet side of the water pump.
The thermostat is designed to provide the fastest warm up possible by preventing leakage through it and to guarantee a minimum engine operating temperature of 88 to 93°C (192 to 199°F). The thermostat also will automatically reach wide open so it will not restrict flow to the radiator as temperature of the coolant rises in hot weather to around 104°C (220°F). Above this temperature the coolant temperature is controlled by the radiator, fan, and ambient temperature, not the thermostat.
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Oct 09, 2010 | 2002 Dodge Intrepid

1 Answer

Do you have to put some type of pellets in your radiator after you instale it ??

yes you do it should say so on the radiator support or the overflow tank. it is stop leak its needed because the cylinders are not part of the block they are loose in there untill the cylinder heads are installed to hold them down.ther is no seal at the bottom of the cyl. sleeve so thats why you need the stop leak
recomend get it at cadillac use the whole package and do it every time you change the coolant

Mar 23, 2010 | 1996 Cadillac DeVille

2 Answers


Ok check if the fan pulls air into the engine, check if the thermostat is not stuck, check whether there is much difference in temperature in the upper hose and lower radiator, checked the radiator cap while the board that if you can check with a tool that can put pressure air to the system to check if you have lost. The engine works without fail if you notice some bugs and feel normal after this you could be that this happening to any cylinder coolant. Thanks

Feb 09, 2010 | 1993 Chevrolet K1500

1 Answer

Leaking heater radiator

get some radiator stop-leak from wal-mart. dump the pellets in the radiator and it will fix its self

Dec 18, 2009 | 2001 Volkswagen Jetta TDI

2 Answers

When replacing the thermostat on my 98 jeep wrangler (4.0 6 cyl.) does the thermostat go in first, then the gasket or the other way around?

Check out the diagram:

The removal of the thermostat from its housing on the 4.0L engine

To install:
  1. Install the replacement thermostat so that the pellet, which is encircled by a coil spring, faces the engine. All thermostats are marked on the outer flange to indicate the proper installed position.
  2. Observe the recess groove in the engine cylinder head .
  3. Position thermostat into this groove with arrow and air bleed hole on outer flange pointing up.
  4. Install replacement gasket and thermostat housing

    CAUTION Tightening the thermostat housing unevenly or with the thermostat out of its recess may result in a cracked housing.

  5. Tighten the housing bolts to 15 ft. lbs. (20 Nm) torque.
  6. Install hoses to thermostat housing.
  7. Install electrical connector to coolant temperature sensor.
  8. Be sure that the radiator draincock is tightly closed. Fill the cooling system.
  9. Start and warm the engine. Check for leaks

WARNING Do not loosen radiator drain **** with system hot and pressurized. Serious burns from coolant can occur.

NOTE Do not waste reusable coolant. If solution is clean, drain coolant into a clean container for reuse. If thermostat is being replaced, be sure that replacement is specified thermostat for vehicle model and engine type.

Dec 06, 2009 | 1998 Jeep Wrangler

1 Answer

I need to replace the thermostat in my 95 vw jetta 1.9 deisel. i dont know where it is under the hood?

You need to follow the top radiator hose to the thermostat housing.Drain down the radiator and remove the bolts holding the thermostat housing down.Remove the thermostat and clean off all the gasket material from both the housing and the mounting portion it was bolted to.Install the new thermostat with the part put in to appear the same as the one removed[pellet part up].Put the housing back on tightening each bolt evenly so that you don't break the housing.This housing should be touqued but most home owners don't own a tourque wrench so tighten it to about the same force on the bolts that it required to get the bolts out.Test run and check for leaks,hope this helps.

Nov 21, 2009 | 1995 Volkswagen Jetta

1 Answer

Thermostat sticking closed with a new thermostat in place

check that thermostat is correctly installed--''pellet'' towards motor,spring towards radiator.check hose[s] aren't collapsing from pressure.

Sep 28, 2009 | 1994 Buick LeSabre

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